All perfect praise be to Allaah, The Lord of the Worlds. I testify that there is none worthy of worship except Allaah, and that Muhammad, sallallaahu ‘alayhi wa sallam, is His Slave and Messenger.
The entire Quran has merits that are countless. But, to the best of our knowledge, there is no Hadeeth to single out the merits of Surah Al-Jinn in particular. According to many scholars, only a few and specific number of Surahs were mentioned in authentic Ahaadeeth that indicate their merits, like Surah Al-Ikhlaas, Surah Al-Faatihah, Surah Al-Baqarah, Surah Aal ‘Imraan, etc. They further mentioned that many of the Ahaadeeth which single out the merits of certain Surahs are either weak or fabricated.
Allaah Knows best.